Abstract
Coalescence dynamics of size-selected gold (Au) clusters (each with nominal 923 atoms), on amorphous Si3N4 substrate at room temperature, has been studied via time-resolved transmission electron microscopy (TEM). We found that the clusters approached each other in two stages. In the first stage, the drift velocity was independent of the particle separation and could be attributed to beam-induced random motion. In the second stage, the clusters were found to jump into contact with a much higher final averaged speed. This is independent of beam dose rates and is attributed to the van der Waal attraction.
Highlights
The clusters were found to jump into contact with a much higher final averaged speed. This is independent of beam dose rates and is attributed to the van der Waal attraction
Coalescence of supported metal nanoparticles/clusters is a common phenomenon in the field of catalysis, whose process is known to relate to many factors, such as size, structure, orientation, temperature, support and environment [1, 2]
!"# ! − 0.576 where 3.36 nm is the average diameter of Au923 clusters measured by an AC-STEM, V is the volume of a cluster, is the volume of a
Summary
Coalescence of supported metal nanoparticles/clusters is a common phenomenon in the field of catalysis, whose process is known to relate to many factors, such as size, structure, orientation, temperature, support and environment [1, 2]. Coalescence dynamics of size-selected gold (Au) clusters (each with nominal 923 atoms), on amorphous Si3N4 substrate at room temperature, has been studied via time-resolved transmission electron microscopy (TEM). The clusters were found to jump into contact with a much higher final averaged speed.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
